Honors astronomy- chapter 3 – Flashcards
Unlock all answers in this set
Unlock answersquestion
Space travelers looking out from the front of their spacecraft would note that the light emitted from the star system toward which they were moving seemed to be:
answer
Getting bluer
question
Which of the following statements is true regarding the Kelvin temperature scale?
answer
Water freezes at 273K
question
Which of the following types of visible light has the highest energy?
answer
Violet
question
Which of the following is constant for all types of electromagnetic waves in space?
answer
Speed
question
According to Wein's Law, if the Sun's surface temperature of 5,800 K were doubled:
answer
The peak of its energy would now fall in the ultraviolet part of the spectrum
question
What does Wien's Law reveal?
answer
The hotter the object, the bluer it gets
question
The fact that doubling the star's surface temperature will halve its peak wavelength is
answer
Wein's Law
question
The frequency at which the intensity of a star's light peaks depends on the _____ of the star.
answer
Temperature
question
At which of these Kelvin temperatures is water a liquid?
answer
300k
question
Stefan's Law says:
answer
That energy radiated by a black body is proportional to T^4
question
Radio
answer
longest waves coming from the coldest sources
question
Ultraviolet
answer
waves under 4,000 Angstroms, blocked by the ozone layer
question
Infrared
answer
trapping of these waves by carbon dioxide creates "greenhouse"
question
Xrays
answer
high energy photons given off by sources at millions of degrees
question
The distance between successive wave crests defines the ________ of a wave
answer
Wavelength
question
Which of these is NOT a form of electromagnetic radiation?
answer
Sound
question
What types of Electro- Magnetic Radiation from space reach the surface of Earth?
answer
Visible light and radio waves
